High clogging, problems to clean, and vulnerability of aluminum injection valve persuade PU Sanat Nazari Machinery to use steel to produce injection valves in 2007.
The company knew that the manufacturing process will not be easy, but performed it for the convenience of the owners of the shoe PU injection machine and to solve the problem in the injection valve part of the head and provided to the PU machine holders without considering the financial benefits with the same cost of the aluminum block and has referred to some of the benefits of steel PU injection valve.
1- shockproof 
2- Guiding the material better
3- Not stripping the gears
4- Not being vulnerable to DMF acid
5- Very long life
6- Very low clogging
7- Easier to clean